Almonds and walnuts are substitutes. Suppose the world demand for walnuts increases. 
Definitions:
Amino Acid
Organic molecule composed of an amino group and an acid group; covalently bonds to produce peptide molecules.
DNA Sequence
The order of nucleotides in a segment of DNA, determining genetic information.
Active Genes
Sections of DNA that are being transcribed and translated into proteins, influencing the traits of an organism.
Heterochromatin
A tightly packed form of DNA, which is transcriptionally inactive, aiding in maintaining the DNA's structural integrity.
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